Referenced on p.12, Carolingian Cavalryman AD 768-986 by D. Nicolle
The Stuttgart Psalter provides the best-known illustrations of arms and armour from the Carolingian period.
It was made around 825 and the abundance of armour, as well as certain aspects of style, hint that it was made in Italy.
(Stuttgart Psalter, Landesbib., Cod. Bib. 2°. 23, Stuttgart, Germany)